CVE-2026-97562smb: client: pin DFS superblock in iterator callback
- 7.5HighCVSS base score
- 0.41%Exploitation in 30 daysEPSS · top 64% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In the Linux kernel, the following vulnerability has been resolved: smb: client: pin DFS superblock in iterator callback tcon_super_cb() stores a raw superblock pointer, but __cifs_get_super() takes its active reference only after iterate_supers_type() has dropped s_umount and its passive reference. Concurrent DFS automount expiry can therefore free the superblock before cifs_sb_active() uses it. A deterministic KASAN test reproduces the race as: BUG: KASAN: slab-use-after-free in cifs_sb_active+0x77/0x80 The same test passes with this change applied. Take the active reference in the callback while iterate_supers_type() still holds s_umount shared. cifs_put_tcp_super() remains the matching release.
Timeline
ID reserved
By Linux
- 1 day later
· 1 day later
Published
- 24 days later
· 24 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H |
| NVDNVD · Received | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.41% · top 64% of all CVEs (15 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Affected products
- affected bacd704a95ad0b93af995aae4a523aa046f46563 – < 3c9acc9835c304013a4faeb969fe9333d66ca9f8
- affected bacd704a95ad0b93af995aae4a523aa046f46563 – < ea43a15cea36dc5ddd832be5bddeac7dd804cbcf
- affected bacd704a95ad0b93af995aae4a523aa046f46563 – < a6b6561522212af852c9ad8a7dca8d59ef2c7377
- affected bacd704a95ad0b93af995aae4a523aa046f46563 – < 5b01a8c0209690db75341528ec53fd87e0ac1460
- affected bacd704a95ad0b93af995aae4a523aa046f46563 – < d806d5a85dcbe2a0f181b2f0f9f61ddfbefa1818
- affected 5.7
- unaffected < 5.7
- unaffected 6.6.158 – ≤ 6.6.*
- unaffected 6.12.111 – ≤ 6.12.*
- unaffected 6.18.53 – ≤ 6.18.*
- unaffected 7.2.7 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References5
- https://git.kernel.org/stable/c/3c9acc9835c304013a4faeb969fe9333d66ca9f8 (opens in a new tab)
- https://git.kernel.org/stable/c/ea43a15cea36dc5ddd832be5bddeac7dd804cbcf (opens in a new tab)
- https://git.kernel.org/stable/c/a6b6561522212af852c9ad8a7dca8d59ef2c7377 (opens in a new tab)
- https://git.kernel.org/stable/c/5b01a8c0209690db75341528ec53fd87e0ac1460 (opens in a new tab)
- https://git.kernel.org/stable/c/d806d5a85dcbe2a0f181b2f0f9f61ddfbefa1818 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-86870 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-97562)Record last updated .